The instructional software incorporates Houdini 2 and is available on USCF Sales. You can also find over a dozen tutorial videos by Steve Lopez on Youtube. Chess King creator Diego Garces told CLO: "It's both simple and extremely reasonably priced at $49 ($50 off from list $99) and super powerful since it has Houdini 2 the strongest engine and GigaKing database with 5 million games. It has over 1500 puzzles and lots of playing modes, including an exclusive 'random' mode that is super fun."
You can also find ChessKing at http://chess-king.com/ and on twitter and facebook. Also be sure you are following @USChess and facebook.com/uschess.